Actually the sync is fine only in Firefox. The problem is that the frame rate is much too fast for IE, where any frame less than 100 ms will be played for 100 ms. I ran into this problem when making my NBA version. Here's what I did: first, remove all the "blank" frames that simply repeat the previous frame (I have no idea why they're there anyway). Then set all the other frames to 100 ms, and then resync the audio based on that.